Detections
Analytics
CVE-2026-113866
medium
Description
When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.
References
https://www.mozilla.org/security/advisories/mfsa2026-115/
https://www.mozilla.org/security/advisories/mfsa2026-114/